New CASX30S & RMA

Regarding the recent issues with the CAX30 cable modem-routers, I appreciate all of the advice/posts to try and fix it. However, none of it worked. Whatever happened completely shot my ability to communicate with my equipment. I was able to get an RMA approved under my hardware warranty. My first question is: when I set up this new router, whenever I receive it, will I run into the same problem again? Secondly, I received an email regarding my RMA. The email contained a link and instructions on how to set up shipping preferences and how to return the defective equipment. When I follow this link, it just tells me that the RMA has already been completed online, which I did not personally do. Did the agent I talked to on the phone do it for me? I have found my RMA request online, and its status is currently 'pending.' Do I need to do anything else regarding this RMA?

Thank you in advance.